Geosynclinal
Pronunciation : Ge`o*syn*cli"nal
Part of Speech : n.
Etymology : [Gr. synclinal.] (Geol.)
Definition : Defn: the downward bend or subsidence of the earth's crust, which allows of the gradual accumulation of sediment, and hence forms the first step in the making of a mountain range; -- opposed to geanticlinal.
Source : Webster's Unabridged Dictionary, 1913